'use strict'

function safeAdd(x, y) {
	let lsw = (x & 0xffff) + (y & 0xffff)
	let msw = (x >> 16) + (y >> 16) + (lsw >> 16)
	return (msw << 16) | (lsw & 0xffff)
}

function bitRotateLeft(num, cnt) {
	return (num << cnt) | (num >>> (32 - cnt))
}

function md5cmn(q, a, b, x, s, t) {
	return safeAdd(bitRotateLeft(safeAdd(safeAdd(a, q), safeAdd(x, t)), s), b)
}

function md5ff(a, b, c, d, x, s, t) {
	return md5cmn((b & c) | (~b & d), a, b, x, s, t)
}

function md5gg(a, b, c, d, x, s, t) {
	return md5cmn((b & d) | (c & ~d), a, b, x, s, t)
}

function md5hh(a, b, c, d, x, s, t) {
	return md5cmn(b ^ c ^ d, a, b, x, s, t)
}

function md5ii(a, b, c, d, x, s, t) {
	return md5cmn(c ^ (b | ~d), a, b, x, s, t)
}

function binlMD5(x, len) {
	/* append padding */
	x[len >> 5] |= 0x80 << (len % 32)
	x[((len + 64) >>> 9 << 4) + 14] = len

	let i
	let olda
	let oldb
	let oldc
	let oldd
	let a = 1732584193
	let b = -271733879
	let c = -1732584194
	let d = 271733878

	for (i = 0; i < x.length; i += 16) {
		olda = a
		oldb = b
		oldc = c
		oldd = d

		a = md5ff(a, b, c, d, x[i], 7, -680876936)
		d = md5ff(d, a, b, c, x[i + 1], 12, -389564586)
		c = md5ff(c, d, a, b, x[i + 2], 17, 606105819)
		b = md5ff(b, c, d, a, x[i + 3], 22, -1044525330)
		a = md5ff(a, b, c, d, x[i + 4], 7, -176418897)
		d = md5ff(d, a, b, c, x[i + 5], 12, 1200080426)
		c = md5ff(c, d, a, b, x[i + 6], 17, -1473231341)
		b = md5ff(b, c, d, a, x[i + 7], 22, -45705983)
		a = md5ff(a, b, c, d, x[i + 8], 7, 1770035416)
		d = md5ff(d, a, b, c, x[i + 9], 12, -1958414417)
		c = md5ff(c, d, a, b, x[i + 10], 17, -42063)
		b = md5ff(b, c, d, a, x[i + 11], 22, -1990404162)
		a = md5ff(a, b, c, d, x[i + 12], 7, 1804603682)
		d = md5ff(d, a, b, c, x[i + 13], 12, -40341101)
		c = md5ff(c, d, a, b, x[i + 14], 17, -1502002290)
		b = md5ff(b, c, d, a, x[i + 15], 22, 1236535329)

		a = md5gg(a, b, c, d, x[i + 1], 5, -165796510)
		d = md5gg(d, a, b, c, x[i + 6], 9, -1069501632)
		c = md5gg(c, d, a, b, x[i + 11], 14, 643717713)
		b = md5gg(b, c, d, a, x[i], 20, -373897302)
		a = md5gg(a, b, c, d, x[i + 5], 5, -701558691)
		d = md5gg(d, a, b, c, x[i + 10], 9, 38016083)
		c = md5gg(c, d, a, b, x[i + 15], 14, -660478335)
		b = md5gg(b, c, d, a, x[i + 4], 20, -405537848)
		a = md5gg(a, b, c, d, x[i + 9], 5, 568446438)
		d = md5gg(d, a, b, c, x[i + 14], 9, -1019803690)
		c = md5gg(c, d, a, b, x[i + 3], 14, -187363961)
		b = md5gg(b, c, d, a, x[i + 8], 20, 1163531501)
		a = md5gg(a, b, c, d, x[i + 13], 5, -1444681467)
		d = md5gg(d, a, b, c, x[i + 2], 9, -51403784)
		c = md5gg(c, d, a, b, x[i + 7], 14, 1735328473)
		b = md5gg(b, c, d, a, x[i + 12], 20, -1926607734)

		a = md5hh(a, b, c, d, x[i + 5], 4, -378558)
		d = md5hh(d, a, b, c, x[i + 8], 11, -2022574463)
		c = md5hh(c, d, a, b, x[i + 11], 16, 1839030562)
		b = md5hh(b, c, d, a, x[i + 14], 23, -35309556)
		a = md5hh(a, b, c, d, x[i + 1], 4, -1530992060)
		d = md5hh(d, a, b, c, x[i + 4], 11, 1272893353)
		c = md5hh(c, d, a, b, x[i + 7], 16, -155497632)
		b = md5hh(b, c, d, a, x[i + 10], 23, -1094730640)
		a = md5hh(a, b, c, d, x[i + 13], 4, 681279174)
		d = md5hh(d, a, b, c, x[i], 11, -358537222)
		c = md5hh(c, d, a, b, x[i + 3], 16, -722521979)
		b = md5hh(b, c, d, a, x[i + 6], 23, 76029189)
		a = md5hh(a, b, c, d, x[i + 9], 4, -640364487)
		d = md5hh(d, a, b, c, x[i + 12], 11, -421815835)
		c = md5hh(c, d, a, b, x[i + 15], 16, 530742520)
		b = md5hh(b, c, d, a, x[i + 2], 23, -995338651)

		a = md5ii(a, b, c, d, x[i], 6, -198630844)
		d = md5ii(d, a, b, c, x[i + 7], 10, 1126891415)
		c = md5ii(c, d, a, b, x[i + 14], 15, -1416354905)
		b = md5ii(b, c, d, a, x[i + 5], 21, -57434055)
		a = md5ii(a, b, c, d, x[i + 12], 6, 1700485571)
		d = md5ii(d, a, b, c, x[i + 3], 10, -1894986606)
		c = md5ii(c, d, a, b, x[i + 10], 15, -1051523)
		b = md5ii(b, c, d, a, x[i + 1], 21, -2054922799)
		a = md5ii(a, b, c, d, x[i + 8], 6, 1873313359)
		d = md5ii(d, a, b, c, x[i + 15], 10, -30611744)
		c = md5ii(c, d, a, b, x[i + 6], 15, -1560198380)
		b = md5ii(b, c, d, a, x[i + 13], 21, 1309151649)
		a = md5ii(a, b, c, d, x[i + 4], 6, -145523070)
		d = md5ii(d, a, b, c, x[i + 11], 10, -1120210379)
		c = md5ii(c, d, a, b, x[i + 2], 15, 718787259)
		b = md5ii(b, c, d, a, x[i + 9], 21, -343485551)

		a = safeAdd(a, olda)
		b = safeAdd(b, oldb)
		c = safeAdd(c, oldc)
		d = safeAdd(d, oldd)
	}
	return [a, b, c, d]
}

function binl2rstr(input) {
	let i
	let output = ''
	let length32 = input.length * 32
	for (i = 0; i < length32; i += 8) {
		output += String.fromCharCode((input[i >> 5] >>> (i % 32)) & 0xff)
	}
	return output
}

function rstr2binl(input) {
	let i
	let output = []
	output[(input.length >> 2) - 1] = undefined
	for (i = 0; i < output.length; i += 1) {
		output[i] = 0
	}
	let length8 = input.length * 8
	for (i = 0; i < length8; i += 8) {
		output[i >> 5] |= (input.charCodeAt(i / 8) & 0xff) << (i % 32)
	}
	return output
}

function rstrMD5(s) {
	return binl2rstr(binlMD5(rstr2binl(s), s.length * 8))
}

function rstrHMACMD5(key, data) {
	let i
	let bkey = rstr2binl(key)
	let ipad = []
	let opad = []
	let hash
	ipad[15] = opad[15] = undefined
	if (bkey.length > 16) {
		bkey = binlMD5(bkey, key.length * 8)
	}
	for (i = 0; i < 16; i += 1) {
		ipad[i] = bkey[i] ^ 0x36363636
		opad[i] = bkey[i] ^ 0x5c5c5c5c
	}
	hash = binlMD5(ipad.concat(rstr2binl(data)), 512 + data.length * 8)
	return binl2rstr(binlMD5(opad.concat(hash), 512 + 128))
}

function rstr2hex(input) {
	let hexTab = '0123456789abcdef'
	let output = ''
	let x
	let i
	for (i = 0; i < input.length; i += 1) {
		x = input.charCodeAt(i)
		output += hexTab.charAt((x >>> 4) & 0x0f) + hexTab.charAt(x & 0x0f)
	}
	return output
}

function str2rstrUTF8(input) {
	return unescape(encodeURIComponent(input))
}

function rawMD5(s) {
	return rstrMD5(str2rstrUTF8(s))
}

function hexMD5(s) {
	return rstr2hex(rawMD5(s))
}

function rawHMACMD5(k, d) {
	return rstrHMACMD5(str2rstrUTF8(k), str2rstrUTF8(d))
}

function hexHMACMD5(k, d) {
	return rstr2hex(rawHMACMD5(k, d))
}

function md5(string, key, raw) {
	if (!key) {
		if (!raw) {
			return hexMD5(string)
		}
		return rawMD5(string)
	}
	if (!raw) {
		return hexHMACMD5(key, string)
	}
	return rawHMACMD5(key, string)
}

export default {
	md5
}